The SK-LSS 3D Laser Sonar Cavity Measurement System is a specialized equipment for measuring underground (mining) cavities, integrating 3D laser scanning and 3D sonar scanning. A single scan accurately captures the 3D shapes of both water-filled and dry spaces, boasting high integration and automation. It is widely used in 3D scanning measurements for geological disaster prevention and control of water-filled cavities, salt cavern gas storage cavity scanning, urban underground space disaster measurement, underground reservoir 3D scanning and monitoring, collapse accidents in mining cavities, and measurement of water inrush disasters in mines.